xl.storageDisks is sometimes passed to some low-level XL functions. Some disks in
xl.storageDisks are set to nil when they encounter some errors. This means all
elements in xl.storageDisks will be nil after some time which lead to an unusable XL.
This patch introduces new command line 'control'
- minio control
TO manage minio server connecting through GoRPC API frontend.
- minio control heal
Is implemented for healing objects.